9.3 Alloys & their Properties (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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What is an alloy?
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What is an alloy?
An alloy is a mixture of a metal with one or more other elements, which are usually other metals or carbon.
Brass is an alloy made from copper and ______.
Brass is an alloy made from copper and zinc.
Why are alloys generally harder and stronger than the pure metals they are made from?
In a pure metal, layers of atoms can slide over each other easily. In an alloy, atoms of different sizes disrupt this regular arrangement, making it harder for layers to slide, so the alloy is harder and stronger.
Stainless steel is an alloy of iron that contains carbon, chromium and ______.
Stainless steel is an alloy of iron that contains carbon, chromium and nickel.
True or False?
Stainless steel is an alloy of iron that contains carbon only.
False.
Stainless steel is an alloy of iron that also contains carbon, chromium and nickel, which give it hardness and resistance to corrosion.
Aluminium alloys are used in aircraft because they have greater ______ than pure aluminium while still having a low density.
Aluminium alloys are used in aircraft because they have greater strength than pure aluminium while still having a low density.
Give one specific use of stainless steel and explain why it is suitable for this use.
Stainless steel is used for cutlery because it is hard and resistant to corrosion, making it durable and safe for food contact.
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